Furnace wall structure



May l0, 1932. E. LUNDGREN FURNACE WALL STRUCTURE Filed DeC. l2, 1928 2Sheets-Sheet Z4/ym INVENTOR.

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A TTORNEYS.

May 10, 1932. E. LUNDGREN FURNACE WALL STRUCTURE Filed Dec. 12, 1928 '2Sheets-Sheet 2 IIIIIIII N V EN TOR. M444,

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, Patented May 10, 1932 UNITED STATES vPATENT OFFICE j EDWIN IIJUNDGBEN,F FREDERICK, MARYLAND, ASSIGNOB T0 INTERNATIONAL 00H- y BUSTIONENGINEERING CORPQRA'IION, V0I' NEW YORK, N. Y., A. OOEPORATION 0lDELAWARE rUnNAcn WALL s'rnUc'rUnE Application med December 12, 1928.Serial No. 325,553.

Multiple retort underfeed stokers are commonly provided with relativelydeep ash pockets having clinker grinders at the bottoms thereof foreecting the gradual discharge of ashes. In stokers of this type, the hotashes entering the dee ash pocket and the burnin of unconsume particlesof fuel therein, su ject the front wall of the ash pocket to an intenseheat, and ithas been found that the front wall structures at present ingeneral commercial use, are not only incapable of effectivelywithstanding such intense heat but, also, in case portions thereof areburned out or otherwise injured it is diicultto repair or replace them.

One of the objects of the present invention is to provide a front wallstructure for the ash ocket of a stoker of the type above indicateg inwhich said disadvantages of the prior constructions are overcome.

Another objectof the invention is to provide a furnace wall structure inwhich the component parts thereof, while permitted to ex and andcontract freel and are securely he d in place, may be easi y removed forreplacement or repair. Still another object of the invention is toprovide novel and improved means for detachably securing the com onentparts of a furnace wall structure in p ace.

These and other objects of the invention and features whereby they maybe attained, will be clealy understood from the following descriptionand accompanying drawings, in which:

Fig. 1; and

ig. 4 is a detail sectional plan view taken substantially on the line4-4 of Fi 3. y

The multiple retort underfeed sto er illustrated in the drawings,isprovided with a retort secon 2, a relatively deep ash ocket 4 at therear thereof, and clinker grin ers 6 at the bottom of the ash pocket.The ash pocket is provided with a front wall 8, side walls 10 and a rearwall 12, ,the rear well being lined with boiler tubes 14. A supportingwall 16 for the rear ends of the retorts is made up ofv I-beams and isspaced a distance 'in front of the front wall 8 of the ash pocket. Thiswall 16 is provided with an o ening v18 throu h which air may' pass fromt e wind box to t e s ace between saidv wall and the front wall of t eash pocket, the supply of air to this space being controlled separatelyfrom the supply of air to the retort sect-ion by means includlng adamper 20.

In accordance with my invention, the front wall 8 of the ash pocket ismade up of bricks or blocks 22 of suitable refractory material that arearranged in superposed horizontal rows with the blocks of adjacent rowsarranged in staggered relation. The several blocks which make up thefront wall `are supported on a flanged seat or shelf 24 se` cured on ahorizonta I-beam 26. The space between the to of this wall structureandthe rear ends of t e retorts is closed by bars or l of the bars orkeys 28 being such as to permit them to raise an lower during theexpansion and contraction of the front wall. The blocks at the upperportion of the front wall are provided with perforations 32 for di'recting air into the ash pocket to assist in the combustion of anyunconsumed fuel therein, the ther blocks being preferably unperforate fThe adjacent sides of adjacent blocks are provided with tongue andgroove connections 36 .to assist in maintaining the blocks in properrelation.

Each block has a body portion having Hat rear, to and bottom sides orfaces. The front si e of the block vis recessed to provide a centrallylocated vertical web or rib 38. This rib 38 on each block is providedwith anv angle iron bracket 48 secured to the supporting wall 16, therebeing a bracket opposite each row of blocks and extending between theside walls of the furnace.

T\o secure each block in place by means of its anchoring rod 42, the rodis turned upwardly, as shown in dotted lines in Fig. 3 so as to placethe end leg 46 in upright position, whereupon the U-shaped bent end ofthe rod is passed through the vertical slot 40 in the block and then therod is swung downwardly and its bent outer end is inserted in theaperture in the associated angle iron 48. When an anchoring rod is thusattached, the leg 46 of the rod prevents disengagement of the rod fromthe block. Each anchoring rod 42 securely holds its block fromappreciable fore and aft movement, but the block is free to movevertically and laterally to allow for expansion and contraction of thewall. When it is desired to remove a block for replacement or repair,the outer or iorward end of the anchoring rod 42 is disengaged from itsbracket 48 and the rod swung upwardly so as to permit it to be removedfrom the block.

It will be apparent that in my improved wall structure as abovedescribed, the several blocks are securely held, and may be easilyremoved and replaced; and the structure as a whole may freely expand andcontract, and is capable of effectively withstanding the intense heat towhich it may be subjected when employed as the front wall of the ashpocket of a stocker of the type above indicated.

As will be evident to those skilled in the art, my invention permitsvarious modifications without departing from the spirit thereof or thescope of the appended claims.

What'rIj claim is:

1. In a multiple retort underfeed furnace having a relatively deep ashpocket with a clinker grinder arranged at the bottom thereof, theimprovement which consists in the front wall of the ash pocket beingmade up of blocks of refractory material arranged in superposed rowswith the blocks of adjacent rows arranged in staggered relation, a metalwall structure spaced a distance in front of said front wall, andconnections between said structure and said front wall for holding eachblock from fore and aft movement but permitting vertical and lateralmovements thereof to allow for expansion and Contraction of said wall.

2. A furnace wall structure made of blocks of refractor material, and adevice detachably secure at a point remote from each block fordetachably securing the block in place in such a manner as to permitexpansion and contraction of said structure, each of said devicesincapable of being detached from the associated block without firstdetaching it from said support.

3. A furnace wall structure comprising blocks of refractory material,and means for holding each block from movement transversely of thestructure but permitting ver tical and lateral movements thereof toallow for expansion and contraction of said structure, comprising asupportspaced a distance from one side of the blocks, and a memberhaving its ends respectively detachably secured to said support and eachblock, each of said members being incapable of being de tached from itsblock without first detaching it from said support:

4. A furnace wall structure comprising blocks of refractory material,and means for holding each block from movement transversely of thestructure but permitting vertical and lateral movements thereof to allowfor expansion and contraction of said struchaving one end detachablysecured to said support and its other end in detachable interlockingengagement with said block whereby upon disengaging said member fromsaid support the member may be moved to disen ge its end fromthe block,each of said mem rs being incapable of being detached from its blockwithout first detaching it from said support.

5. A furnace wall structure comprising blocks, each block having aprojecting centrally located vertical rib having an elongated verticalslot extending transversely therethrough, a support -spaced a distancefrom one side of the blocks, and means for holding each block frommovement toward and from said support but permittin lateral and verticalmovements thereof to a low for expansion and contraction, comprising arod having a U-shaped bend in one end with the end leo` thereof bent atan angle to the body of sait rod and adapted to be passed through saidslot, so that when the rod is swung down into substantially horizontalrposition said bent end is caused to interlock with said rib, the otherend of said rod being adapted to be detachably secured to said support.

6. In a multiple retort under eed stoker having a relatively dee ashpocket with a clinker grinder arrange at the bottom thereof, theimprovement which consists in the front wall of the ash pocket beingmade up of blocks of refractory material arran ed in superposed rowswith the blocks of adjacent rows arranged in staggered relation, a metalsaid front wall, a shelf member on which said blocks rest, and fuelsupporting ke s having their rear portions restingl upon t e top row ofblocks and capable of vertical movement to allow for vertical expansionand contraction-of the blocks. l

In testimony whereof, I have signed my name to this specification this7th day of December, 1928.

EDWIN LUNDGREN.

